HRoscar

2006 Lexus IS250. Heater was working fine once i got to work it did stop working... was blowing clod air. I check the coolant level its was at the minimum.. But there is a coolant there. So what other reasons beside coolant can cause my heater to stop working

Joepeer

Blocked heater hose or the actuator that directs warm water (coolant) to heat the air box is malfunctioning. I don’t know if actuator is vacuum operated or electric.

Lmood

iTrader: (3)

Wrong section, however try adding more coolant first.

PatrickISF

Usually that is a sign that coolant is low.

leisinjp

I have an ISF but mine did the same. Heat just stopped working. Coolant was low, I filled it up and now the heat blows hot like it did before. I would definitely try filling up the coolant before you do anything more pricey.

Rickna

iTrader: (3)

Have you checked for leaks in the cooling system?

vraa

iTrader: (2)

For what it's worth I'm having a similar issue, took more than 30 minutes for the car to start blowing hot air

I'll have to check the coolant

vraa

iTrader: (2)

I topped off the coolant and it solved the issue. I have heater blowing hot air now. Many thanks to everyone + the Houston Lexus GroupMe Chat for advice

Jz39

iTrader: (2)

^^^Did you check to make sure you don’t have the valley plate leak?

vraa

iTrader: (2)

Not yet, but I didn't see any pink anywhere, this was my first coolant top off that I can recall at 98k miles

512ISF

iTrader: (1)

vraa

iTrader: (2)

I am not an expert but I do not think it matters, I just made sure the shop across the street put in coolant that was also pink.

I found Toyota coolant on Amazon but didn't want to wait a few days, I want an immediate resolution.

It worked, however, I wonder if my leak has gotten worse; my car seems to take more than a few minutes to reach three bars on the dash.

lobuxracer

iTrader: (2)

Three bars for the oil temp? That can take 30 minutes at this time of year depending on OAT.

vraa

iTrader: (2)

Okay I'm glad you mentioned that because after about -30- minutes of driving I was at two bars and I got really worried. Lately on short (under 15 minutes) trip, I don't see it moving past 1 bar!

In the summer time, it's usually at three bars pretty quickly.

In the past few weeks Houston has had below 40F weather - it sucks.

lobuxracer

iTrader: (2)

Perfectly normal for sub 40F temperatures. It takes a long time to heat up almost 10 quarts of oil when you're shunting most of the excess heat into the cabin.